Cambic Horizon Official

| Horizon | Key Distinguishing Feature | | :--- | :--- | | | Weak to moderate alteration; some color or structural change; no significant accumulation of clay, iron, or organic matter. | | Argillic | Significant, measurable increase in clay content from the overlying horizon (clay skins or oriented clay on ped faces). | | Spodic | Accumulation of amorphous organic matter, aluminum, and iron (usually dark reddish-black or brown). | | Ochric epipedon | A surface horizon (not subsurface) that is too light-colored or too thin to be a Mollic or Umbric epipedon. | | Parent material (C horizon) | No evidence of pedogenic alteration; retains original rock structure or sedimentary layering. |